а как в этом поделии заскринить екран? gnome-screensaver отказывается выполнить
gnome-screensaver --debug

(gnome-screensaver:9838): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:66:21: Junk at end of value

(gnome-screensaver:9838): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:125:43: Invalid animation description

(gnome-screensaver:9838): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:131:17: Invalid animation description

(gnome-screensaver:9838): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1308:0: unknown @ rule

(gnome-screensaver:9838): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1393:97: 'currentColor' is not a valid color name

(gnome-screensaver:9838): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1401:32: Junk at end of value

(gnome-screensaver:9838): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1413:13: 'animation' is not a valid property name

(gnome-screensaver:9838): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1553:17: Invalid animation description

(gnome-screensaver:9838): Gtk-WARNING **: Theme parsing error: gnome-applications.css:90:18: Horizontal and vertical offsets are required

(gnome-screensaver:9838): Gtk-WARNING **: Theme parsing error: gnome-applications.css:154:39: Missing closing bracket for pseudo-class

(gnome-screensaver:9838): Gtk-WARNING **: Theme parsing error: granite-widgets.css:159:28: 'px' is not a valid color name
[gs_debug_init] gs-debug.c:106 (16:50:28):     Debugging enabled
[main] gnome-screensaver.c:86 (16:50:28):     initializing gnome-screensaver 3.4.1
[query_session_id] gs-listener-dbus.c:1452 (16:50:28):     org.freedesktop.ConsoleKit.Manager.GeneralError raised:
Unable to lookup session information for process '9838'

[init_session_id] gs-listener-dbus.c:1473 (16:50:28):     Got session-id: (null)
[gs_fade_init] gs-fade.c:883 (16:50:28):     Fade type: 3

** (gnome-screensaver:9838): WARNING **: Couldn't get presence status: The name org.gnome.SessionManager was not provided by any .service files
[gs_watcher_set_active] gs-watcher-x11.c:277 (16:50:28):     turning watcher: ON
[listener_dbus_handle_system_message] gs-listener-dbus.c:854 (16:50:28):     obj_path=/org/freedesktop/DBus interface=org.freedesktop.DBus method=NameAcquired destination=:1.119
[on_bg_changed] gs-manager.c:549 (16:50:28):     background changed